Null Pointer Dereference in tty: synclink_gt
Summary
GSD-2022-1003210: tty: synclink_gt: Fix null-pointer-dereference in slgt_clean(). Affects Kernel versions < 8a95696bdc0e13f8980f05b54a3b9081963d1256. No fix is published. How to fix ↓
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Background
The tty package in the Linux Kernel is responsible for handling terminal input and output. It provides the necessary functionality for communication between user processes and the underlying hardware. The synclink_gt module within the tty package is specifically designed for synchronous serial communication. It allows devices to transmit and receive data in a synchronized manner.
However, a vulnerability has been discovered in the synclink_gt module that can lead to a null pointer dereference in the slgt_clean() function. This vulnerability can be triggered under certain conditions, potentially resulting in a system crash or other unexpected behavior.
Vulnerability Detail
The null pointer dereference vulnerability in slgt_clean() occurs when a null pointer is accessed, leading to a crash or undefined behavior. This vulnerability can be exploited by an attacker with local access to the system or through a maliciously crafted input. By triggering this vulnerability, an attacker may be able to crash the system, disrupt communication, or potentially execute arbitrary code with kernel-level privileges.
The vulnerability has been assigned the ID GSD-2022-1003210 and has been fixed in Linux Kernel version v5.15.47 by commit 8a95696bdc0e13f8980f05b54a3b9081963d1256.
How To Fix
No fixed version is published for this vulnerability.
To fix this vulnerability, it is recommended to update the Linux Kernel to version v5.15.47 or later. This update includes the necessary patch to address the null pointer dereference in slgt_clean().
To update the Linux Kernel, follow these steps:
- Identify the current version of the Linux Kernel installed on your system.
- Check for the availability of the latest stable release of the Linux Kernel.
- Download the source code for the latest stable release.
- Compile and install the updated Linux Kernel.
- Reboot the system to apply the changes.
It is important to note that updating the Linux Kernel may require advanced knowledge and expertise. It is recommended to consult the official documentation and seek assistance from experienced professionals if needed.
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Workaround
As a temporary workaround, users can disable the synclink_gt module to mitigate the risk of exploitation. This can be achieved by executing the following commands as root:
rmmod synclink_gt
Conclusion
The null pointer dereference vulnerability in the tty: synclink_gt module of the Linux Kernel can lead to system crashes and potential code execution. It is crucial to update the Linux Kernel to version v5.15.47 or later to mitigate this vulnerability. Alternatively, users can apply the temporary workaround of disabling the synclink_gt module. For further assistance and support in vulnerability remediation, please contact DevNack.com.
See every vulnerability recorded for Kernel →
FAQ
The vulnerability can lead to a system crash, disruption of communication, or potential execution of arbitrary code with kernel-level privileges.
An attacker with local access to the system or through a maliciously crafted input can exploit this vulnerability.
Yes, this vulnerability has been fixed in Linux Kernel version v5.15.47 by commit 8a95696bdc0e13f8980f05b54a3b9081963d1256.
To update the Linux Kernel, follow the provided steps in the 'how_to_fix' section of this report.
Yes, a temporary workaround is available. Please refer to the 'workaround' section of this report for instructions.
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